I put ur code in myProduct constructor as it is called from
other code . But it gives me AccesControl Exception.

Then what shold be the problem ??
I am using serialized methods their ...readExternal, WriteExternal.
is there any problem

Thanks,

It's telling you what the problem is: no security mgr.

try {//
When not already set

  if
(System.getSecurityManager() ==
null) {

     
// set a new security manager

      System.setSecurityManager(
new
RMISecurityManager());

  }

}catch (SecurityException
e) {// whatever}